The cover of a 1960s Picture Library publication, specifically Western Library No. 42: "The Faraway Land Beyond the Sea". It's about a pair of railroad workers in 1870s California who become separated from their work gang during a storm, and in the subsequent flood they find themselves washed out into the Pacific Ocean clinging to the buoyant wreckage of a water tower, where after an indeterminate amount of time adrift, they wash ashore in a hitherto undiscovered country where the unnaturally long-lived humans co-exist with giant bird-people called Vrhüvd and are ruled by the mysterious and terrifying Queen of Darkness. See more